Bathtub



FIG. 1 is a perspective view of a bathtub, showing my design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof, the opposite side being thesame as the side shown; and

FIG. 4 is a front elevational view thereof, the rear being the same asthe front shown.

The ornamental design for a bathtub, as shown and described.